Power supply



FIG. 1 is a view of perspective view showing our new design;

FIG. 2 is a front view showing our design;

FIG. 3 is a side view showing one side of our design, the opposite side view being a mirror image thereof;

FIG. 4 is a rear view showing our design;

FIG. 5 is a top plan view showing our design; and,

FIG. 6 is a bottom plan view showing our design. 

The ornamental design for a power supply, as shown and described. 